题干
According to Lee, it was Ben’s carelessness that _______ the accident. But Ben _______ his wrong doing.
A：led to; got the hang of
B：caused; got away from
C：accounted for; got away with
D：resulted in; went away with
答案(点此获取答案解析）
C
力F1与F2作用下，使物体通过一段位移。在此过程中，力F1对物体做功4J ，力F2对物体做功3J ，则力F1与F2的合力在此过程中对物体做功为： 